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18 terms

AP Biology Chapter 4

Carbon and the molecular diversity of life
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vitalism
states that organic molecules come from a life force independent of chemical or physical laws
mechanism
holds that physical and chemical laws can account for all natural phenomena
carbon atom
has 6 electrons, forms 4 covalent bonds
tetrahedron
shape when a carbon has four single bonds
carbon skeleton
form the skeletons of most organic molecules, vary in length, shape (chain, branched, ring), number and location of double bonds, and other elements covalently bonded to available sites
hydrocarbons
organic molecules consisting only of carbon and hydrogen (ex. fossil fuels), hydrophobic
isomer
compound with the same molecular formula but different structural arrangements (different properties)
structural isomers
differs in arrangement of what is bonded to what (usually single bonds)
geometric isomers
same sequence of covalently bonded atoms but differ in spatial arrangement due to inflexibility of double bonds
enantiomers
isomers that are mirror images of each other, left and right handed versions which differ in their biological activity
functional groups
a specific configuration of atoms commonly attached to the carbon skeletons of organic molecules and usually involved in chemical reactions, mostly hydrophilic
hydroxyl group
a hydrogen atom is bonded to an oxygen atom, which in turn is bonded to the carbon skeleton of the organic molecule. Name: alcohols. is polar as a result of the electrons spending more time near the electronegative oxygen atom
carbonyl group
consists of a carbon atom joined to an oxygen atom by a double bond. Name: ketones (the group is within a carbon skeleton), aldehydes (the group is at the end of the carbon skeleton). found in sugars
carboxyl group
when an oxygen atom is double bonded to a carbon atom that is also bonded to an -OH group. Name: carboxylic acids, organic acids. has acidic properties
amino group
consists of a nitrogen atom bonded to 2 hydrogen atoms and to the carbon skeleton. Name: amines. acts as a base. compounds that contain both this group and a carboxyl group are called amino acids.
sulfhydryl group
consists of a sulfur atom bonded to an atom of hydrogen. Name: thiols. "cross linking" of 2 sulfhydryl groups helps to stabilize protein structure, "cross linking" of cysteines in hair proteins maintains the curliness or straightness of hair
phosphate group
a phosphorus atom is bonded to 4 oxygen atoms; 1 oxygen is bonded to the carbon skeleton, 2 oxygens carry negative charges. Name: organic phosphates. Contributes negative charge to the molecule of which it is a part, has the potential to react with water which releases energy (ATP)AT
ATP
stands for adenosine triphosphate. consists of an organic molecule called adenosine attached to a string of 3 phosphate groups. an important source of energy for cellular processes. the primary energy transferring molecule in the cell